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Significant earthquake

This summarises a recorded earthquake only; it is not a warning or a prediction. Follow AFAD and the competent authorities for official statements and guidance.

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4.9

Pagan region, Northern Mariana Islands

20 October 2026, 10:09:08 (+03) 2026-10-20 07:09:08 UTC

3 sources: EMSC, USGS, GFZ mb
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Magnitude
4.9 mb
Depth
250.0 km
Coordinates
18.8377, 145.5173
Data consistency
96/100

Regional activity (100 km)

Last 24 hours
0
Last 7 days
0
Last 30 days
3

Approximate energy released

≈ 338 t TNT

1.41e+12 J

Approximated with the Gutenberg–Richter relation (log E = 1.5 M + 4.8); depends on magnitude type. Gutenberg & Richter (1956).

Did you feel this earthquake?

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Community reports

Based on voluntary reports from users; not an instrumental measurement or official intensity. For official information follow AFAD and Kandilli Observatory announcements.

Impact information reported by sources

  • USGS Earthquake Hazards Program Tsunami flag: No

These values are automatic products of the respective agency, not an assessment by this platform. For tsunami warnings follow the Kandilli Observatory Regional Earthquake-Tsunami Monitoring Center and AFAD.

Nearby places

No records.

Nearby faults (50 km)

No mapped fault within 50 km.

Last year, within 100 km

5 earthquakes

By magnitude

  • M0 0
  • M1 0
  • M2 0
  • M3 0
  • M4 4
  • M5 1
  • M6 0
  • M7 0
  • M8+ 0

By depth

  • 0–10 km 0
  • 10–20 km 0
  • 20–40 km 0
  • 40–70 km 0
  • 70–150 km 3
  • 150+ km 2

Largest previous earthquakes within 100 km

Largest earthquakes in the platform catalogue and entries from historical catalogues (with citation).

Comparison with past records

…

No earlier earthquakes are recorded in this area.

  • Source:

Where does this earthquake come from?

Source comparison

Agency Magnitude Depth Time (UTC) Difference from master Original record
EMSC-CSEM
PAGAN REG., N. MARIANA ISLANDS
 4.9 mb 230.0 km 07:09:07.260 Δt 1.7 sn · 11.39 km · ΔM 0 Original record
USGS Earthquake Hazards Program Displayed
Pagan region, Northern Mariana Islands
 4.9 mb 250.0 km 07:09:08.960 Δt 0 sn · 0 km · ΔM 0 Original record
GFZ GEOFON
Mariana Islands
 5.0 mb 237.6 km 07:09:08.320 Δt 0.64 sn · 6.9 km · ΔM +0.1 Original record

This value summarises agreement between sources; it is not a measure of scientific accuracy. Euro-Mediterranean Seismological Centre (EMSC-CSEM) — CC BY 4.0 U.S. Geological Survey (USGS) Earthquake Hazards Program — Public domain (U.S. Government) GEOFON Program, GFZ Helmholtz Centre for Geosciences — CC BY 4.0

Revision history

  1. 20.10.2026 12:50:28 · EMSC · update

    depth: 250 → 230 latitude: 18.8377 → 18.9402 longitude: 145.5173 → 145.508 time: 2026-10-20T07:09:08.960+00:00 → 2026-10-20T07:09:07.260+00:00

  2. 20.10.2026 10:59:40 · GFZ · update

    depth: 228.5 → 237.6 latitude: 18.911 → 18.9 longitude: 145.526 → 145.52 magnitude: 5.1 → 5 time: 2026-10-20T07:09:07.510+00:00 → 2026-10-20T07:09:08.320+00:00

  3. 20.10.2026 10:46:55 · SISTEM · recompute

    depth: 250 → 250.03 source count: 2 → 3 review status: automatic → reviewed confirming sources: emsc,gfz → emsc,usgs,gfz preferred source: 3 → 4

  4. 20.10.2026 10:33:33 · EMSC · update

    depth: 215 → 250 latitude: 18.9469 → 18.8377 longitude: 145.5265 → 145.5173 magnitude: 5.2 → 4.9 time: 2026-10-20T07:09:06.020+00:00 → 2026-10-20T07:09:08.960+00:00

  5. 20.10.2026 10:33:33 · SISTEM · recompute

    depth: 215 → 250 latitude: 18.9469 → 18.8377 longitude: 145.5265 → 145.5173 magnitude: 5.2 → 4.9 time: 2026-10-20T07:09:06.020Z → 2026-10-20 07:09:08.960+00:00

  6. 20.10.2026 10:29:18 · EMSC · update

    latitude: 18.9096 → 18.9469 longitude: 145.4868 → 145.5265 magnitude: 5 → 5.2 time: 2026-10-20T07:09:06.490+00:00 → 2026-10-20T07:09:06.020+00:00 magnitude type: m → mb

  7. 20.10.2026 10:29:18 · SISTEM · recompute

    latitude: 18.9096 → 18.9469 longitude: 145.4868 → 145.5265 magnitude: 5 → 5.2 time: 2026-10-20T07:09:06.490Z → 2026-10-20 07:09:06.020+00:00 magnitude type: m → mb

  8. 20.10.2026 10:18:50 · SISTEM · recompute

    source count: 1 → 2 confirming sources: emsc → emsc,gfz

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